125 lines
4.5 KiB
Ruby
125 lines
4.5 KiB
Ruby
# frozen_string_literal: true
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module Paperclip
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# This transcoder is only to be used for the MediaAttachment model
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# to check when uploaded videos are actually gifv's
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class Transcoder < Paperclip::Processor
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# This is the H.264 "High" value taken from https://www.dr-lex.be/info-stuff/videocalc.html
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BITS_PER_PIXEL = 0.11
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def initialize(file, options = {}, attachment = nil)
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super
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@current_format = File.extname(@file.path)
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@basename = File.basename(@file.path, @current_format)
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@format = options[:format]
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@time = options[:time] || 3
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@passthrough_options = options[:passthrough_options]
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@convert_options = options[:convert_options].dup
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@vfr_threshold = options[:vfr_frame_rate_threshold]
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end
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def make
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metadata = VideoMetadataExtractor.new(@file.path)
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raise Paperclip::Error, "Error while transcoding #{@file.path}: unsupported file" unless metadata.valid?
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update_attachment_type(metadata)
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update_options_from_metadata(metadata)
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destination = Tempfile.new([@basename, @format ? ".#{@format}" : ''])
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destination.binmode
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@output_options = @convert_options[:output]&.dup || {}
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@input_options = @convert_options[:input]&.dup || {}
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case @format.to_s
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when /jpg$/, /jpeg$/, /png$/, /gif$/
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@input_options['ss'] = @time
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@output_options['f'] = 'image2'
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@output_options['vframes'] = 1
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when 'mp4'
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unless eligible_to_passthrough?(metadata)
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size_limit_in_bits = MediaAttachment::VIDEO_LIMIT * 8
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desired_bitrate = (metadata.width * metadata.height * 30 * BITS_PER_PIXEL).floor
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duration = [metadata.duration, 1].max
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maximum_bitrate = (size_limit_in_bits / duration).floor - 192_000 # Leave some space for the audio stream
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bitrate = [desired_bitrate, maximum_bitrate].min
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@output_options['b:v'] = bitrate
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@output_options['maxrate'] = bitrate + 192_000
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@output_options['bufsize'] = bitrate * 5
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if high_vfr?(metadata)
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@output_options['vsync'] = 'vfr'
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@output_options['r'] = @vfr_threshold
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end
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end
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end
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command_arguments, interpolations = prepare_command(destination)
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begin
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command = Terrapin::CommandLine.new('ffmpeg', command_arguments.join(' '), logger: Paperclip.logger)
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command.run(interpolations)
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rescue Terrapin::ExitStatusError => e
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raise Paperclip::Error, "Error while transcoding #{@basename}: #{e}"
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rescue Terrapin::CommandNotFoundError
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raise Paperclip::Errors::CommandNotFoundError, 'Could not run the `ffmpeg` command. Please install ffmpeg.'
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end
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destination
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end
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private
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def prepare_command(destination)
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command_arguments = ['-nostdin']
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interpolations = {}
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interpolation_keys = 0
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@input_options.each_pair do |key, value|
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interpolation_key = interpolation_keys
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command_arguments << "-#{key} :#{interpolation_key}"
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interpolations[interpolation_key] = value
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interpolation_keys += 1
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end
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command_arguments << '-i :source'
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interpolations[:source] = @file.path
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@output_options.each_pair do |key, value|
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interpolation_key = interpolation_keys
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command_arguments << "-#{key} :#{interpolation_key}"
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interpolations[interpolation_key] = value
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interpolation_keys += 1
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end
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command_arguments << '-y :destination'
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interpolations[:destination] = destination.path
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[command_arguments, interpolations]
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end
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def update_options_from_metadata(metadata)
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return unless eligible_to_passthrough?(metadata)
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@format = @passthrough_options[:options][:format] || @format
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@time = @passthrough_options[:options][:time] || @time
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@convert_options = @passthrough_options[:options][:convert_options].dup
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end
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def high_vfr?(metadata)
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@vfr_threshold && metadata.r_frame_rate && metadata.r_frame_rate > @vfr_threshold
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end
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def eligible_to_passthrough?(metadata)
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@passthrough_options && @passthrough_options[:video_codecs].include?(metadata.video_codec) && @passthrough_options[:audio_codecs].include?(metadata.audio_codec) && @passthrough_options[:colorspaces].include?(metadata.colorspace)
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end
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def update_attachment_type(metadata)
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@attachment.instance.type = MediaAttachment.types[:gifv] unless metadata.audio_codec
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end
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end
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end
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